V. G. BOLTYANSKY <br/><br/>
DIFFERENTIATION EXPLAINED 

 - MOSCOW  MIR PUBLISHERS  1977 
 -  62P 
<br/><br/><label>Subjects--Topical Terms: </label><br/><br/>
<br/><br/><label>Dewey Class. No.: </label>515.3/BOL/DIF